0ccefbc6e9
I thought this was the root cause of bug 1925564, but turns out it's not. Still, mousedown doesn't guarantee a mouseup if you move the mouse out of the element, so seems wise not to use it. It only sorta works because thumb dragging captures the scrollbar... Use the hover state and the drag state instead, which simplifies the code anyways. Differential Revision: https://phabricator.services.mozilla.com/D226905
247 lines
8.6 KiB
C++
247 lines
8.6 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef nsSliderFrame_h__
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#define nsSliderFrame_h__
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#include "mozilla/Attributes.h"
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#include "nsContainerFrame.h"
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#include "nsRepeatService.h"
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#include "nsAtom.h"
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#include "nsCOMPtr.h"
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#include "nsITimer.h"
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#include "nsIDOMEventListener.h"
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class nsITimer;
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class nsScrollbarFrame;
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class nsSliderFrame;
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namespace mozilla {
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class nsDisplaySliderMarks;
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class PresShell;
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class ScrollContainerFrame;
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} // namespace mozilla
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nsIFrame* NS_NewSliderFrame(mozilla::PresShell* aPresShell,
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mozilla::ComputedStyle* aStyle);
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class nsSliderMediator final : public nsIDOMEventListener {
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public:
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NS_DECL_ISUPPORTS
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nsSliderFrame* mSlider;
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explicit nsSliderMediator(nsSliderFrame* aSlider) { mSlider = aSlider; }
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void SetSlider(nsSliderFrame* aSlider) { mSlider = aSlider; }
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NS_DECL_NSIDOMEVENTLISTENER
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protected:
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virtual ~nsSliderMediator() = default;
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};
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class nsSliderFrame final : public nsContainerFrame {
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public:
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NS_DECL_FRAMEARENA_HELPERS(nsSliderFrame)
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NS_DECL_QUERYFRAME
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friend class nsSliderMediator;
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friend class mozilla::nsDisplaySliderMarks;
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explicit nsSliderFrame(ComputedStyle* aStyle, nsPresContext* aPresContext);
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virtual ~nsSliderFrame();
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// Get the point associated with this event. Returns true if a single valid
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// point was found. Otherwise false.
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bool GetEventPoint(mozilla::WidgetGUIEvent* aEvent, nsPoint& aPoint);
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// Gets the event coordinates relative to the widget associated with this
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// frame. Return true if a single valid point was found.
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bool GetEventPoint(mozilla::WidgetGUIEvent* aEvent,
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mozilla::LayoutDeviceIntPoint& aPoint);
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#ifdef DEBUG_FRAME_DUMP
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nsresult GetFrameName(nsAString& aResult) const override {
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return MakeFrameName(u"SliderFrame"_ns, aResult);
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}
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#endif
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void Reflow(nsPresContext* aPresContext, ReflowOutput& aDesiredSize,
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const ReflowInput& aReflowInput,
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nsReflowStatus& aStatus) override;
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// nsIFrame overrides
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void Destroy(DestroyContext&) override;
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void BuildDisplayList(nsDisplayListBuilder* aBuilder,
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const nsDisplayListSet& aLists) override;
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void BuildDisplayListForThumb(nsDisplayListBuilder* aBuilder,
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nsIFrame* aThumb,
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const nsDisplayListSet& aLists);
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nsresult AttributeChanged(int32_t aNameSpaceID, nsAtom* aAttribute,
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int32_t aModType) override;
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void Init(nsIContent* aContent, nsContainerFrame* aParent,
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nsIFrame* aPrevInFlow) override;
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nsresult HandleEvent(nsPresContext* aPresContext,
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mozilla::WidgetGUIEvent* aEvent,
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nsEventStatus* aEventStatus) override;
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// nsContainerFrame overrides
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void SetInitialChildList(ChildListID aListID,
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nsFrameList&& aChildList) override;
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void AppendFrames(ChildListID aListID, nsFrameList&& aFrameList) override;
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void InsertFrames(ChildListID aListID, nsIFrame* aPrevFrame,
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const nsLineList::iterator* aPrevFrameLine,
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nsFrameList&& aFrameList) override;
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void RemoveFrame(DestroyContext&, ChildListID, nsIFrame*) override;
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nsresult StartDrag(mozilla::dom::Event* aEvent);
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nsresult StopDrag();
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void StartAPZDrag(mozilla::WidgetGUIEvent* aEvent);
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static int32_t GetCurrentPosition(nsIContent* content);
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static int32_t GetMinPosition(nsIContent* content);
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static int32_t GetMaxPosition(nsIContent* content);
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static int32_t GetIncrement(nsIContent* content);
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static int32_t GetPageIncrement(nsIContent* content);
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static int32_t GetIntegerAttribute(nsIContent* content, nsAtom* atom,
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int32_t defaultValue);
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NS_IMETHOD HandlePress(nsPresContext* aPresContext,
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mozilla::WidgetGUIEvent* aEvent,
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nsEventStatus* aEventStatus) override;
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NS_IMETHOD HandleMultiplePress(nsPresContext* aPresContext,
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mozilla::WidgetGUIEvent* aEvent,
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nsEventStatus* aEventStatus,
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bool aControlHeld) override {
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return NS_OK;
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}
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MOZ_CAN_RUN_SCRIPT
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NS_IMETHOD HandleDrag(nsPresContext* aPresContext,
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mozilla::WidgetGUIEvent* aEvent,
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nsEventStatus* aEventStatus) override {
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return NS_OK;
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}
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NS_IMETHOD HandleRelease(nsPresContext* aPresContext,
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mozilla::WidgetGUIEvent* aEvent,
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nsEventStatus* aEventStatus) override;
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// Return the ratio the scrollbar thumb should move in proportion to the
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// scrolled frame.
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float GetThumbRatio() const;
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// Notify the slider frame that an async scrollbar drag was started on the
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// APZ side without consulting the main thread. The block id is the APZ
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// input block id of the mousedown that started the drag.
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void AsyncScrollbarDragInitiated(uint64_t aDragBlockId);
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// Notify the slider frame that an async scrollbar drag requested in
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// StartAPZDrag() was rejected by APZ, and the slider frame should
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// fall back to main-thread dragging.
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void AsyncScrollbarDragRejected();
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bool OnlySystemGroupDispatch(mozilla::EventMessage aMessage) const override;
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// Returns the associated scroll container frame that contains this slider if
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// any.
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mozilla::ScrollContainerFrame* GetScrollContainerFrame();
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private:
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bool GetScrollToClick();
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nsScrollbarFrame* Scrollbar();
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bool ShouldScrollForEvent(mozilla::WidgetGUIEvent* aEvent);
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bool ShouldScrollToClickForEvent(mozilla::WidgetGUIEvent* aEvent);
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bool IsEventOverThumb(mozilla::WidgetGUIEvent* aEvent);
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void PageUpDown(nscoord change);
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void SetCurrentThumbPosition(nsIContent* aScrollbar, nscoord aNewPos,
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bool aIsSmooth, bool aMaySnap);
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void SetCurrentPosition(nsIContent* aScrollbar, int32_t aNewPos,
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bool aIsSmooth);
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void SetCurrentPositionInternal(nsIContent* aScrollbar, int32_t pos,
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bool aIsSmooth);
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void CurrentPositionChanged();
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void DragThumb(bool aGrabMouseEvents);
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void AddListener();
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void RemoveListener();
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bool IsDraggingThumb() const;
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void SuppressDisplayport();
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void UnsuppressDisplayport();
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void StartRepeat() {
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nsRepeatService::GetInstance()->Start(Notify, this, mContent->OwnerDoc(),
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"nsSliderFrame"_ns);
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}
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void StopRepeat() {
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nsRepeatService::GetInstance()->Stop(Notify, this);
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mCurrentClickHoldDestination = Nothing();
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}
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void Notify();
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static void Notify(void* aData) {
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(static_cast<nsSliderFrame*>(aData))->Notify();
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}
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void PageScroll(bool aClickAndHold);
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void SetupDrag(mozilla::WidgetGUIEvent* aEvent, nsIFrame* aThumbFrame,
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nscoord aPos, bool aIsHorizontal);
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nsPoint mDestinationPoint;
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// If we are in a scrollbar track click-and-hold, this is populated with
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// the destination of the scroll started at the most recent tick of the
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// repeat timer.
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Maybe<nsPoint> mCurrentClickHoldDestination;
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RefPtr<nsSliderMediator> mMediator;
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float mRatio;
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nscoord mDragStart;
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nscoord mThumbStart;
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int32_t mCurPos;
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nscoord mRepeatDirection;
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bool mDragInProgress = false;
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// true if an attribute change has been caused by the user manipulating the
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// slider. This allows notifications to tell how a slider's current position
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// was changed.
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bool mUserChanged;
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// true if we've handed off the scrolling to APZ. This means that we should
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// ignore scrolling events as the position will be updated by APZ. If we were
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// to process these events then the scroll position update would conflict
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// causing the scroll position to jump.
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bool mScrollingWithAPZ;
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// true if displayport suppression is active, for more performant
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// scrollbar-dragging behaviour.
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bool mSuppressionActive;
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// If APZ initiated a scrollbar drag without main-thread involvement, it
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// notifies us and this variable stores the input block id of the APZ input
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// block that started the drag. This lets us handle the corresponding
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// mousedown event properly, if it arrives after the scroll position has
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// been shifted due to async scrollbar drag.
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Maybe<uint64_t> mAPZDragInitiated;
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nscoord mThumbMinLength;
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static bool gMiddlePref;
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}; // class nsSliderFrame
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#endif
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